and cnn's susan candiotti is also here in newtown. she's got the latest on what progress the police are making. >> reporter: investigators are learning more each day that may explain what led 20-year-old adam lanza to launch a vicious attack on young children and adults at an elementary school. >> our investigators at the crime scene, the school, and secondarily at the secondary crime scene that was discussed did produce some very -- a very good evidence in this investigation. that our investigators will be able to use in hopefully painting a complete picture as to how and more importantly, why this occurred. >> reporter: police won't say what that evidence is, however, investigators have been checking out gun ranges and sporting good stores. they followed a lead the shooter tried to buy a gun tuesday at this location. >> there's no information that substantiated that he tried to acquire guns recently. >> federal guns also said they collected weapons at the home. three more guns were found. these three rifle models, all older. they're